Condition: Excessive Fuel Consumption; Condition: Erratic Idle (Misfiring); Condition: Engine Stalls At Irregular Intervals; Condition: Misfiring At Highway Driving Speed - Volvo 760 Owner's Manual

1987 Volvo 760
No spark<./td>
Spark plugs, high tension leads or distributor
cap wet or defective.

Condition: Excessive fuel consumption

Possible cause Correction
Check
Fuel lines leaking.
tightness.
Spark plugs worn Replace plugs.
pg. 86 Service diagnosis

Condition: Erratic idle (misfiring)

Possible cause
Intake system leaking.
Spark plugs, high tension leads or distributor cap
worn (detective).
Worn spark plugs.

Condition: Engine stalls at irregular intervals

Possible cause
Defective wires.
Intake system leaking. Check vacuum hose connections at manifold and auxiliary air valve.
Fuel filter clogged.

Condition: Misfiring at highway driving speed

file:///K|/ownersdocs/1987/1987_760/87760_05.htm (18 of 20)12/30/2006 7:55:34 AM
Correction
Check wire terminals at: fuel pump, fuse No. 1 and 11, coil, distributor, ignition
switch and relays.
Clean fuel tank filter and replace line fuel filter.
If there is no spark, check that the high tension lead
from the coil to the distributor cap is connected and
that the wires to the distributor and coil are connected.
Clean the parts with a dry cloth or spray with a
moisture remover. Replace defective or worn parts.
If no fault is found following the above steps, contact
your Volvo dealer.
Correction
Check vacuum hose connections at manifold and
auxiliary air valve.
Clean distributor cap and leads, check the cap for
cracks. Replace defective or worn parts.
Remove. Clean or replace spark plugs.